Question

which best describes a mixture? it has a single composition, and it has a set of characteristics that does not change. it can have different compositions, but it has a set of characteristics that does not change. it has a single composition, but it has a set of characteristics that does change. it can have different compositions, and it has a set of characteristics that does change.

Explanation:

A mixture is made up of two or more substances physically combined. Its composition can vary from one sample to another, and its properties such as density, melting - point etc. can change depending on the relative amounts of the components.

Answer:

It can have different compositions, and it has a set of characteristics that does change.